水平轴风力机翼型大攻角气动性能计算研究

CFD CALCULATIONS OF AERODYNAMIC PERFORMANCES OF HIGH-OF-ATTACK ON WIND TURBINE AIRFOILS

耦合RANS和基于线性稳定性分析的eN转捩预测方法,进行风力机翼型的大攻角气动性能计算,以期提供风力机叶片分析/设计中使用翼型的更为准确和完备的气动性能数据。以风力机翼型S809为例,计算了翼型表面从出现分离气泡到大面积分离的情形,并比较了S-A和B-L两种湍流模型对计算结果的影响。通过对已有经典风力机翼型DU97-W-300和新设计风力机翼型WA21ak5在-180°～180°攻角范围内的气动计算,对计算结果和实验结果以及国外风力机叶片分析/设计中使用的基于Viterna方法由有限攻角范围的气动性能外推到-180°～180°的结果进行比较。结果表明,RANS方程计算气动性能和实验结果吻合较好,为建立风力机翼型气动性能数据库提供了基础。

A steady, 2-Dimensilnal Reynolds-Averaged Navier-Stokes （RANS） solver coupled with a transition prediction based on eN method was used to CFD calculations of high angle-of-attack on airfoils for wind turbine ap- plications to apply more accurate aerodynamic data table in analysis/design of wind turbine blades. The compari- sons of pressure coefficient of the representative wind turbine airfoil S809 were made to investigate the effects of tur- bulence models of S-A and B-L. A wind turbine airfoil of DU97-W-300 and a new designed airfoil of WA21ak5 for a large wind turbine were calculated from the angle-of-attack of - 180° to 180°, and the comparisons were made between the results of CFD, experiment and extended by Viterna method as well. The results showed that CFD cal- culations agree better with experimental results than the Viterna method and give a base to form a usable turbine air- foil database.